Drawing roll



June 5 .1923.

P A. MURPHY- DRAWING ROLL Filed May 25 1922 Patente d June 5, 1923.

-n s re-T PATRICK-A. MURPHY; or LYNNQMASSAOHUSETTS; ASSIGNOR 'ro TEXTILE RUBBER ooL,

' eaa m r a are as;

F Bo's'ro'N;MAssAoHosErraAcoaronArron or lvnrsseennsnr'rs." I

DRAWING; aoLL.

Application fi1ed-May 25,

To all whom it may concern:

Be it known that I PATRICK A. MU PHY, a citizen of the United States residing at Lvnn, in the county of Essex and State of Massachusetts, have invented new anduseful Improvements in Drawing-- Rolls, of which the following is a specification;

This invention relates to drawingrolls for spinning machines.

For many years it has been the practice in the textile industry to equip the various types of spinning machines which employ drawing rolls with top rolls having an outer covering composed of leather and while many attemptshave beenmade to provide a substitute for said leather; and top drawing rolls have been constructed wit-hooverings composed of certain fabrics" treated with various materials, to my knowledge none of these rollshave proved successful and no rolls have ever been constructed which have proved practical with a cover? ing consisting entirely of a rubber compound; I

between the abutting ends oftheleather and often the thicknessofsaid leather varies to such an extent that it is difficult'to construct a perfectly accurate roll. Leather also deoil, especially present'yin woolen yarn; Moreover inall cotton and woolen mills the atmosphere is kept moistby employing humidifiers in large numbers and the at-- mosphere' is at alltimes saturated'with said moisture which has a. bad effect upon'the leather often causing the same to become detached from the metal core of the rollto which it is attached by an adhesive ma- 40 terial.

The object of the present invention therefore is to so construct a top drawing roll that all of the above objections will be eliminated, the roll produced being perfectly accurate and free from seams and crevices and composed of materials not easily affected by the before-mentioned conditions and at the same time greatly reducing the cost of the rolls.

The invention consists in the construction of drawing rolls as set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings: v

Figure 1 represents a sectional elevation rests upon the roll 7 and is'driven' by fric In leather rolls there is invariably a spa-ce teriorates quickly being easilyaffected by- 1922. Serial Nb. 5 3,514." r

of a portion'of a spinning frame illustr'at mg a general type of machine employing:

Likenumerals refer to likeparts through; I

out the several views of the; drawings.

In the drawings, 5 representsa portion of a frame of a spinning machine of Wellknown type upon which are rotatably mounted a top drawing roll 6 and a" fluted metallicdrawing roll 7.- The.-.top'* 17011 tional contact with the latter roll." A plurallty of strands 8 of material composed of very loosely assembled cotton, silk or woolen' fib ersare fed between aplurality of:

guide rolls 9,10, 11. and. 12 by;which they i are loosely joined. into a single' strandjl3 whichjthen passes between rolls 14; mars, thence over a roll l6 a-nd' between they draw,-

ing rolls 6 and 7. a

A. spool 17; rests upon which it is'raised and lowered and also rotated by mechanism not shown but well known tovthose skilled in theart, and a spindle l9 extends vertically through saidi spool and-has a flierQO attached thereto. r The spindle 19" and flier- 20 are rotated very rapidly by mechanism not shown and also well lgnown'to those skilled, in the art, and the fibers of the strand 13 .which ble-f,

fore it passes through thelrolls 6 and 7 cona I r 901 v.

sists of several strands 8 loosely 'united are simultaneously merged and drawn: into a smallerandmore comp; wound upon the spool 17-.

old andwe1l know-n in the artandpthe ct strand 2 1 and";

All the mechanism thus far described p 5] noveltyof-the present-invention resides the construction of the top drawing roll 6" and particularly in a material used as'a q covering for said roll, the latter' being ofh a such a character that the strand may pass between the rolls 6 and 7 without danger of the: delicate fibers of which it is composed being crushed or broken.- i

The roll 6 is constructed with a rigid core or boss 22preferably composed of metal and having grooves extending around its periphery upon which is placed a com mr,

tively thin layer of a suitable rubber compound 23 which becomes very hard when cured and'which very tightly adheres to the periphery of the metal core 22. The layer 23 is placed upon the core 22 in a plastic state and is evenly distributed around the periphery thereof after Which a layer 24 of suitable thickness of another rubber compound is placed upon the layer 23. The materials of which the layer 24 is composed are as follows :14 pounds Ceylon rubber, 3 pounds black rubber shoddy, 12 pounds blue lead, 4 pounds litharge, 3!; pounds fine asbestos, 3 pounds lime and 2'}- pounds of sulphur. After being prepared in the usual well known manner the composition in a plastic state is placed in a mass around the layer 23, and the core with the superimposed layers 23 and 24 thereon is then placed in a mould and subjected to heat at a temperature of from 150 to 200 for a period of from one and one quarter hours to one and one-half hours during which period the composition is cured, thereby rendering the inner layer 23 very hard and the outer layer 24 sufficiently hard to be durable yet at the same time retaining a sufficient resiliency for the purpose required. After being taken from the mould the periphery of the roll is finished so that the roll Will be perfectly cylindrical and the periphery of said roll being perfectly smooth and free from cracks and scams will not injure the most delicate fibers.

The layer of hard rubber 23 is utilized as a medium for fastening the outer layer 24 to the core 22 to prevent said layer from creeping thereon, it having been found that while it is possible to secure the layer 24 directly to the core, there is a tendency for said layer to loosen after long continued use, Whereas the layer 23 when cured, adheres to the core so tightly that there is no danger of it ever becoming loosened, and during the curing process, the adjacent surfaces of the layers 23'and 24, in effect, unite and form a single mass.

The material of the covering 24 as above constructed has been found very durable, is not affected by the oil present in woolen yarns and is impervious to the moisture in the room, being benefited by said moisture ratherthan being injured thereby. By actual test it has been found that by using my improved roll a better quality of yarn may be produced, said yarn being drawn much more evenly and at the same time producing a greater yardage than is possible with rolls having a leather covering. Moreover the cost of producing rolls in accordance with my invention is much less than the cost of producing leather covered rolls and the rubber rolls will last very much longer than the leather :rolls.

It has also been found when rolls are used constructed in accordance with this invention, that much less power is required to drive the machine upon which they are employed for the reason that it is not necessary to force the top drawing roll 6 against the lower drawing roll 7 with as much pressure to obtain the necessary gripping effect as is the case with leather covered rolls.

I claim:

1. A drawing roll having, in combination, a rigid core and a plurality of superimposed layers of rubber compound located upon said core, the degree of hardness of said layers decreasing from the inner layer outward.

2. A drawing roll having, in combination, a rigid core, a layer of hard rubber compound surrounding said core and a second layer of rubber compound surrounding said first layer and consisting of Ceylon rubber, black rubber shoddy, blue lead, litharge,

fine asbestos, lime and sulphur, said layers being moulded and cured upon said core to produce a softer layer than said first-named layer.

3. A drawing roll having, in combination,

a rigid core, a layer of hard rubber compound surrounding said core and a second layer of rubber compound surrounding said first layer and embodying the fol lowing materials in the following proportions, 14 pounds of Ceylon rubber, 3 pounds of black rubber shoddy, 12 pounds blue lead, 4 pounds litharge, 39; pounds fine asbestos, 3 pounds of lime and 2% pounds of sulphur, said layers being moulded and cured upon said core to produce a softer layer than said first named layer.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit nesses.

PATRICK A. MURPHY. Witnesses FRANKLIN E. Low, HAZEL F. LA MUDGE. 

